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To test whether the variation between two populations differ significantly using F test:
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard deviation of $2.14. The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
LSAT scores are normally distributed, with a mean of 150 and s = 10.
What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean (to 4 decimals)?
By using this data and incorporating seasonal effects, predict quarterly turnover for 2010.
Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
What is the probability that the project will be completed in 17 months or less?
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
Find the probability that a randomly selected employee earns less than $5.43.
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